Rational use of Biochemistry testing. annual refresher course for family physicians November Dr. Julie St-Cyr
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1 Rational use of Biochemistry testing annual refresher course for family physicians November Dr. Julie St-Cyr
2 Declaration "I (we) declare that I have no conflicts of interest in the authorship of this contribution.
3 Learning objectives Organizations promoting rational use of biochemistry tests Identify the appropriate biochemistry tests recommended by the CTFPHC (now the CTFOTPHE) and the USPSTF for the periodic health exam (screening) Learn about the best tests for specific diagnoses
4 In 2012 the ABIM Foundation launched Choosing Wisely with a goal of advancing a national dialogue on avoiding wasteful or unnecessary medical tests, treatments and procedures
5 Key Principles We need to order tests and prescribe medications based on best evidence. Unnecessary medications can cause unwanted side effects, and unnecessary testing can lead to further testing or possible harm. We have an obligation to our patients, profession and society to be responsible stewards of medical resources. If we are all committed to evidence-based prescribing and test ordering, we can reduce the great overuse of health care resources in the US, and make medical care more efficient and affordable
6 Mission INESSS s mission is to promote clinical excellence and the efficient use of resources in the health and social services sector. At the heart of the mission, INESSS assesses, in particular, the clinical advantages and the costs of the technologies, medications and interventions used in health care and personal social services. It issues recommendations concerning their adoption, use and coverage by the public plan, and develops guides to clinical practice in order to ensure their optimal use.
7 Usage judicieux de 14 analyses biomédicales: Avril 2014 Les résultats des 14 analyses sont présentés dans les sections suivantes, soit d abord les analyses en biochimie suivies des analyses en hématologie. Liste d analyses incluses biochimie: 1. Amylase et lipase sériques pour le diagnostic de la pancréatite aiguë 2. Aspartate aminotransférase (AST) pour la détection d une atteinte hépatique 3. Bilirubine directe pour la détection d une cholestase 4. Créatine kinase MB (CK-MB) pour le diagnostic de l infarctus aigu du myocarde
8 Usage judicieux de 14 analyses biomédicales: Avril 2014 Résultats: 5. Électrophorèse des protéines sériques 6. Lactate déshydrogénase (LDH) dans le diagnostic de l infarctus aigu du myocarde 7. Thyroxine Libre (T4L) pour le diagnostic d une maladie thyroïdienne 8. Urée pour l évaluation de la fonction rénale 9. Vitamine D 25-OH
9 Why order tests Screening Diagnosis To assess response to a specific treatment To determine prognosis
10 Periodic screening Why develop periodic screening procedures? asymptomatic adults harbor organic disease screening can detect a disease at an early stage early detection can alter the course of the disease.
11 Preventive Care Checklist Forms
12 Preventive Care Checklist Biochemistry tests males and females age 21-64: Hemoccult multiphase q1-2 years (age 50) Fasting Blood Glucose of A1C if at risk Fasting Lipid Profile ( 40 yr or sooner if at risk males) or Fasting Lipid Profile ( 50 yr or postmenopausal or sooner if at risk females )
13 Preventive Care Checklist Biochemistry tests: males and females age >65: Hemoccult multiphase q1-2 years (age 65-74) Fasting Blood Glucose or A1C if at risk Fasting Lipid Profile q1-5 years (up to 75)
14 CTF recommendations Do s= A & B recommendations Don'ts= D & E recommendations
15 CTF D & E recommendations Diabetes Mellitus Blood glucose fasting General population Ovarian cancer CA125 pre and post menopausal Pancreatic cancer CA 19-9 General population Prostate cancer PSA Males> 50 UTI Urine dipstick/culture Elderly ambulatory males, elderly
16
17 Type 2 Diabetes Mellitus: Screening Release Date: October 2015 Population Adults aged 40 to 70 years who are overweight or obese Recommendation The USPSTF recommends screening for abnormal blood glucose as part of cardiovascular risk assessment in adults aged 40 to 70 years who are overweight or obese. Clinicians should offer or refer patients with abnormal blood glucose to intensive behavioral counseling interventions to promote a healthful diet and physical activity. Grade B
18 Prostate Cancer: Screening Release Date: May 2012 Population Men, Screening with PSA Recommendation The U.S. Preventive Services Task Force (USPSTF) recommends against prostatespecific antigen (PSA)-based screening for prostate cancer. Grade D
19 Colorectal Cancer: Screening Release Date: June 2016 Population Recommendation Grade A Adults aged 50 to 75 years The USPSTF recommends screening for colorectal cancer starting at age 50 years and continuing until age 75 years. The risks and benefits of different screening methods vary.
20 Thyroid Dysfunction: Screening Release Date: March 2015 Population Nonpregnant, asymptomatic adults Recommendation The USPSTF concludes that the current evidence is insufficient to assess the balance of benefits and harms of screening for thyroid dysfunction in nonpregnant, asymptomatic adults. Grade I
21 Not screening tests! Tumor markers such as PSA, CEA, CA 125, CA 19-9: 1. are not useful as a screening assay for cancer detection in the normal population 2. results can not be interpreted as absolute evidence of the presence or absence of cancer 3. serum markers are not specific for malignancy and values may vary by method 4. useful for evaluating patients response to therapy 5. predicting recurrence
22 CA-125 CA -125 there is a low incidence of ovarian cancer in the general population (age-adjusted incidence of 17 per 100,000 women). In women at average risk, the positive predictive value of an abnormal screening test is, at best, approximately 2% (i.e., 98% of women with positive test results will not have ovarian cancer).
23 Using tests for diagnosis Common diagnostic tests in unselected ambulatory patients such as: liver enzymes, amylase, tumor markers, protein electrophoresis are not indicated for screening and should be used for specific diagnosis A consequence of automation and social changes.
24 Sequential multiple analyzer or SMA
25 Common diagnostic tests Biochemical profiles are not routinely indicated for screening asymptomatic adults. Probability that a healthy person will have normal results for 1 test= 95% 6 tests=74% 20 tests=36%
26 What is the question?
27 Does my patient have pancreatitis? Order lipase if not available pancreatic amylase is the best choice. These tests are to be used in asymptomatic individuals.
28 Amylase Mysterious increase in pancreatic amylase
29
30 Does my patient have liver disease? Useful for diagnosing hepatocellular inflammation or obstruction as in patients with jaundice, with history of alcohol abuse or on certain therapeutic drugs. Enzymes of hepatocellular necrosis: Enzymes of cholestasis: AST and ALT Alk Phos and GGT
31 Does my patient have liver disease? These are not LFTs Live enzymes answer the question is there liver disease. True liver function tests include: albumin, PT and bilirubin
32 Liver enzymes hyperbilirubinemia hepatocellular disorder increased AST and ALT biliary obstruction increased Alk Phos infection drugs intra or extra hepatic obstuction
33 Causes of Chronically Elevated Aminotransferase Levels Pratt, D. S. et al. N Engl J Med 2000;342:
34 Medications, Herbs, and Drugs or Substances of Abuse Reported to Cause Elevations in Liver-Enzyme Levels Pratt, D. S. et al. N Engl J Med 2000;342:
35 Laboratory Tests That May Identify the Cause of Elevated Aminotransferase Levels in a Patient with No Symptoms Pratt, D. S. et al. N Engl J Med 2000;342:
36
37
38 What is my patient s renal function? Do I wish to evaluate renal filtration or the glomerulus as a selective sieve? egfr: The test estimates the volume of blood that is filtered by the kidneys over a given period of time. There is consensus that an egfr represents the best routinely available measurement of kidney function.
39 Renal function Calculation of an egfr is currently based on the MDRD equation. More recently, a modified equation has been endorsed by KDIGO, by the Canadian Society of Nephrology (CSN), and the Ontario Renal Network (ORN). The CKD-EPI equation is considered to be more accurate than the MDRD equation for calculating egfr, particularly for patients with an egfr in the ml/min/1.73 m2 range, for females, and for younger patient populations.
40 Renal function The CKD-EPI equation uses a more sophisticated calculation for the egfr, but includes the same factors as MDRD equation; those are age, gender, serum creatinine, and ethnicity. No additional patient information needs to be provided by clinicians. Note: For patients who do not have muscle mass typical of their demographic group, a 24-hour urine creatinine clearance may be used to improve diagnostic accuracy
41 Renal function Why not creatinine alone? In assessment of renal function, plasma creatinine remains normal down to a GFR of about 30 ml/min. Creatinine is therefore not a sensitive marker of renal function.
42 Who should be tested for CKD? Patients with diabetes mellitus Patients with hypertension Patients with heart failure Patients with atherosclerotic coronary, cerebrovascular or peripheral vascular disease Patients with unexplained anemia Patients with a family history of ESRD First nations peoples
43 Renal function What about urea? The principal clinical utility of serum urea, which lies in its measurement in conjunction with that of serum creatinine and subsequent calculation of the urea nitrogen-to-creatinine ratio. This can be used as a crude discriminator between prerenal and postrenal azotemia. As part of the work up of patients with stage 3 CKD to evaluate the need for nutritional status assessment. To determine timely inititiation of dialysis
44 Mrs White 81 year old female with a serum creatinine of 90 μmol/l (normal). EQUATION:VALUE: 52 (ml/min/1.73 m2) CKD-EPI CREATININE (2009) egfr : ml/min/1.73m 2 = a moderate decrease in renal function.
45 Mr. Weider 26 year old african american body builder with a creatinine of 90 μmol/l (normal). EQUATION:VALUE: 117(mL/min/1.73 m2) CKD-EPI CREATININE (2009)
46
47 Renal function Glomerular permeability: in diseases such as diabetes there may develop an increased glomerular permeability with progressively increasing excretion of higher molecular weight proteins as permeability increases (e.g., albumin, IgG). Normally we excrete up to 30mg/24hr of albumin but we can use the ACR (albumin/creatinine) to screen for diabetic nephropathy instead of a 24 hr urine collection.
48 Testing for CKD A random urine sample can identify kidney injury. Urine albumin or protein excretion should be quantified with an albumin to creatinine ratio (ACR) or a protein to creatinine ratio (PCR). 24 hour urine collections are not routinely required to assess creatinine clearance or protein excretion as they are cumbersome and often inaccurate.
49
50 Specific diseases
51
52 CDA CPG 2018 Screening for type 2 diabetes: using a fasting plasma glucose (FPG) and/or glycated hemoglobin (A1C) should be performed every 3 years in individuals 40 years of age or in individuals at high risk using a risk calculator.
53 CDA CPG 2018 Diagnosis of DM: A fasting plasma glucose level of 7.0 mmol/l or a 2-hour plasma glucose value in a 75 g oral glucose tolerance test of 11.1 mmol/l or a glycated hemoglobin (A1C) value of 6.5% (no fasting needed)
54 CDA CPG 2018 Therapy in most individuals with type 1 or type 2 diabetes should be targeted to achieve: an A1C 7.0% in order to reduce the risk of microvascular and, if implemented early in the course of disease, macrovascular complications. In order to achieve an A1C 7.0%, people with diabetes should aim for: FPG or preprandial PG target of mmol/l and a 2-hour PPG target of mmol/l
55
56 CDA CPG 2018 Screening for CKD: In adults, screening for CKD in diabetes: Random urine ACR and a serum creatinine converted into an egfr. Screening should commence at diagnosis of diabetes in individuals with type 2 diabetes and 5 years after diagnosis in adults with type 1 diabetes and repeated yearly thereafter.
57 CDA CPG 2018 A diagnosis of CKD should be made in patients with a random urine ACR 2.0 mg/mmol and/or an egfr<60 ml/min on at least 2 of 3 samples over a 3-month period.
58 2016 Canadian Cardiovascular Society Guidelines for the Management of Dyslipidemia for the Prevention of Cardiovascular Disease in the Adult
59 Figure 2 Canadian Journal of Cardiology , DOI: ( /j.cjca ) Copyright 2016 Canadian Cardiovascular Society Terms and Conditions
60 Figure 3 Canadian Journal of Cardiology , DOI: ( /j.cjca ) Copyright 2016 Canadian Cardiovascular Society Terms and Conditions
61 Friedewald equation Friedewald (1972) Formula: LDL = TC - HDL - TG/2.17 (mmol/l). If TG 4.5 mmo/l formula is precluded.
62 References Clinical Practice Guidelines: 2013 Canadian Diabetes Association Canadian Task Force on the Periodic Health Exam
63 References PDF] 2016 Update of the Canadian Cardiovascular Society Guidelines for...
64 References McPherson & Pincus: Henry's Clinical Diagnosis and Management by Laboratory Methods, 21st ed.; SI Units Tietz NW (ed): Clinical Guide to Laboratory Tests.
65 References Clinical practice guidelines Web-based calculators: Downloadable calculators and PDA formats:
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